Which of the following scenarios correctly demonstrates the transformation of mass into energy as given by Einstein's equation, E = mc2?
A) When hydrogen is fused into helium, whether in the Sun or in a nuclear bomb, the mass difference is turned into energy.
B) An object accelerated to a great speed has a lot of kinetic energy.
C) A mass raised to a great height has a lot of gravitational potential energy.
D) When you boil a pot of water, it has a high heat content, or thermal energy.
E) A burning piece of wood produces light and heat, therefore giving off radiative and thermal energy.
A
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A) 2 B) 3 C) 1 D) 5 E) 4
Mary and Debra stand on a snow-covered roof. They both throw snowballs with the same initial speed, but in different directions
Mary throws her snowball downward, at 30° below the horizontal; Debra throws her snowball upward, at 30° above the horizontal. Which of the following statements are true about just before the snowballs reach the ground below? (There could be more than one correct choice.) A) Debra's snowball will stay in the air longer than Mary's snowball. B) Mary's snowball will stay in the air longer than Debra's snowball. C) Both snowballs will take the same amount of time to hit the ground. D) Debra's snowball has exactly the same acceleration as Mary's snowball. E) Mary's snowball has a greater downward acceleration than Debra's snowball.
A model car is propelled by a cylinder of carbon dioxide gas. The cylinder emits gas at a rate of 5.00 g/s with an exit speed of 80.0 m/s. The car has a mass of 455 g, including the CO2 cylinder. Starting from rest, what is the car's initial acceleration?
a. 0.879 m/s2 b. 40.0 m/s2 c. 36.4 m/s2 d. 7.28 m/s2 e. 1.38 m/s2